feat(gmail): overhaul Gmail node + create gmail trigger (#3734)

packages/nodes-base/nodes/Google/Gmail/v1/MessageLabelDescription.ts

@@ -0,0 +1,63 @@
+import { INodeProperties } from 'n8n-workflow';
+
+export const messageLabelOperations: INodeProperties[] = [
+	{
+		displayName: 'Operation',
+		name: 'operation',
+		type: 'options',
+		noDataExpression: true,
+		displayOptions: {
+			show: {
+				resource: ['messageLabel'],
+			},
+		},
+		options: [
+			{
+				name: 'Add',
+				value: 'add',
+				action: 'Add a label to a message',
+			},
+			{
+				name: 'Remove',
+				value: 'remove',
+				action: 'Remove a label from a message',
+			},
+		],
+		default: 'add',
+	},
+];
+
+export const messageLabelFields: INodeProperties[] = [
+	{
+		displayName: 'Message ID',
+		name: 'messageId',
+		type: 'string',
+		default: '',
+		required: true,
+		displayOptions: {
+			show: {
+				resource: ['messageLabel'],
+				operation: ['add', 'remove'],
+			},
+		},
+		placeholder: '172ce2c4a72cc243',
+	},
+	{
+		displayName: 'Label Names or IDs',
+		name: 'labelIds',
+		type: 'multiOptions',
+		typeOptions: {
+			loadOptionsMethod: 'getLabels',
+		},
+		default: [],
+		required: true,
+		displayOptions: {
+			show: {
+				resource: ['messageLabel'],
+				operation: ['add', 'remove'],
+			},
+		},
+		description:
+			'The ID of the label. Choose from the list, or specify IDs using an <a href="https://docs.n8n.io/code-examples/expressions/">expression</a>.',
+	},
+];